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Document No.: 304S/MM
Date of Issue:
08/14
3-6
H
P
H
Ltd.
3.5 Free Play in Wing and Tail plane Attachments
Tangential play of ± 0,936 in (24 mm) at the wingtip is permissible. If this play is
larger, washers of 0.00787 to 0.01181 in (0.2 to 0.3 mm) thickness should be
packed under the wing attachment bolts until the main spar rigging pin is firm.
To add the washers under the wing pins, the pins are removed and tightened
with washers in place.
Take note to not damage the pins.
Main wing spar pin and bushes may have a maximum play of 0.002363 in (0.06
mm).
For the horizontal tailplane, a tangential play of ± 0.0591 in (1.5 mm) and a play
of ± 0.1575 in (4mm) around the longitudinal axis, both measured at the
tailplane tip, is the maximum permissible.
The play at the forward stabilizer attachment point should not exceed 0.002362
in (0.06mm).
3.6 Primary and secondary structures
Primary structures are those structures that bear flight loads and are critical to
flight such as the wings, load-bearing portions of the fuselage, the empennage
and control surfaces, crew seat.
Damage that compromises the structural integrity of any of these can result in
loss of control of the aircraft with no ability to make a safe landing or very
severe hazards to pilot. Another term for them is "Critical Load-Bearing
Structures".
Secondary structures would be those components that do not bear flight loads
and are not directly critical to flight such as fairings, cowlings, baffles, canopy,
access panels, armrests, instrument panels, etc. Damage to these may result in
undesireable flight characteristics and possibly lead to other damage but the
airplane will probably keep flying to a safe landing.
3.7 Damage
Before take-off, and in particular after long-term storage, an inspection should
be carried out.
Check for small changes, such as holes, blisters or unevenness in the surface.
This may be a signal that something is wrong.
It is best to consult an experienced person in GRP and CRP if stressed parts
are in question.
Better still, to make available photographs of the damage to a specialized
representative of the manufacturer, who will advise the correct procedure,
therefore saving unnecessary repair attempts.
FRP parts are neither expensive nor difficult to repair, but a different
technology, compared to sailplanes of other materials, is used.
One must know the procedure for the repairs.